Update teach-history-and-languages-with-strategy-game.md

test fullstop, line 392.

Author: anisa-hawes

en/lessons/teach-history-and-languages-with-strategy-game.md

@@ -389,7 +389,7 @@ The 0̸ A.D. project points to the superiority of free and open source sof
 [^3]: The 0̸ A.D. project is released under three open source licenses:
     - Binaries (compiled): [GPL 3.0](https://perma.cc/7M42-VBQH)
     - Engine and code: [GPL 2.0](https://perma.cc/98WZ-FBJM) or later
-    - Artwork, music, and other non-code resources: [CC BY-SA 3.0](https://perma.cc/A6PE-K8TA)
+    - Artwork, music, and other non-code resources: [CC BY-SA 3.0](https://perma.cc/A6PE-K8TA).
 
 [^4]: GIMP occupies about 250mb of storage space. It is licensed under the [GPL 3.0](https://perma.cc/2WZT-YVMK) or later.